Paper 9: Development of a Fluidic Control System for Reciprocating Gas Compressors

Abstract

A programme of work has been carried out to assess the possible advantages of using fluidics to provide the digital ‘on–off’ control function for reciprocating gas compressors. The basic concept uses a precision test gauge as a high-accuracy pressure sensor, and the use of low-pressure fluidic equipment to provide the logic sequence for operation of the unloading equipment. Up to 28th February 1970 a simple on–off system of this type had achieved over 3000 hours of satisfactory operation, controlling the main works air compressor of the author's company†. Further design proposals are presented for multi-step and/or multi-compressor control systems which have considerable advantages in relation to cost, reliability, and simplicity compared with conventional systems, particularly where high accuracy, or the use of flameproof equipment, is of primary concern.